XSLTC is 100% compliant with the TrAX poriton of the
JAXP API. This
API is a standard extension to Java and there is not much point in describing
it in detail in this document.

XSLTC's extensions to JAXP/TrAX

The Source and Result classes within TrAX are
used to handle input and output documents. These classes can be extended to
encapsulate additional input types. XSLTC's TrAX implementation contains an
extension to the Source class:

org.apache.xalan.xsltc.trax.XSLTCSource

This extension class can be used to build XSLTC's internal
DOM and cache it for later usage. The following sample shows how to
use it with a Transformer:

If you do chose to implement a DOM cache, you should have your cache
implement the javax.xml.transform.URIResolver interface so
that documents loaded by the document() function are also read
from your cache.